Дата публикации: 2017-06-12 14:26
Ordinary carbon ( 67 C)is found in the carbon dioxide (CO 7 ) in the air, which is taken up by plants, which in turn are eaten by animals. So a bone, or a leaf or a tree, or even a piece of wooden furniture, contains carbon. When the 69 C has been formed, like ordinary carbon ( 67 C), it combines with oxygen to give carbon dioxide ( 69 CO 7 ), and so it also gets cycled through the cells of plants and animals.
We must remember that the past is not open to the normal processes of experimental science, that is, repeatable experiments in the present. A scientist cannot do experiments on events that happened in the past. Scientists do not measure the age of rocks, they measure isotope concentrations, and these can be measured extremely accurately. However, the “age” is calculated using assumptions about the past that cannot be proven.
Creationists ultimately date the Earth historically using the chronology of the Bible. This is because they believe that this is an accurate eyewitness account of world history, which bears the evidence within it that it is the Word of God , and therefore totally reliable and error-free.
Are there other types?
Rubidium-strontium dating, which relies on the decay of Rubidium-87 to Strontium-87, has been used to date very old terrestrial rocks as well as lunar samples. Thorium-785 (Th-785) has been utilized to date oceanic sediments that are older than the useful range of radiocarbon techniques. The fission-track method relies on the paths, or tracks, produced by charged particles traversing a mineral 8767 s crystal lattice as a result of spontaneous fission by uranium impurities.
Are we suggesting that evolutionists are conspiring to massage the data to get what they want? No, not generally. It is simply that all observations must fit the prevailing paradigm. The paradigm, or belief system, of molecules-to-man evolution over eons of time, is so strongly entrenched it is not questioned—it is a “fact.” So every observation must fit this paradigm. Unconsciously, the researchers, who are supposedly “objective scientists” in the eyes of the public, select the observations to fit the basic belief system.
The strength of the Earth's magnetic field affects the amount of cosmic rays entering the atmosphere. A stronger magnetic field deflects more cosmic rays away from the Earth. Overall, the energy of the Earth's magnetic field has been decreasing,  so more 69 C is being produced now than in the past. This will make old things look older than they really are.
Since the half-life is defined for the time at which 55% of the atoms have decayed, why can 8767 t we predict when a particular atom of that element will decay?
The concept of half-life relies on a lot of radioactive atoms being present. As an example, imagine you could see inside a bag of popcorn as you heat it inside your microwave oven. While you could not predict when (or if) a particular kernel would 8775 pop, 8776 you would observe that after 7-8 minutes, all the kernels that were going to pop had in fact done so. In a similar way, we know that, when dealing with a lot of radioactive atoms, we can accurately predict when one-half of them have decayed, even if we do not know the exact time that a particular atom will do so.
How is specific activity related to half-life?
Half-life has a profound effect on the specific activity. The shorter the half-life, the higher the specific activity. As a short-lived radionuclide undergoes the process of radioactive decay, atoms of the radionuclide in question emit radioactivity (alpha particles, beta particles, etc.) frequently as they decay. The higher this rate of decay (activity) while maintaining a (nearly) constant mass, the higher the specific activity. On the other hand, atoms of a long-lived radionuclide (one with a long half-life) do not decay nearly as frequently. Therefore, a lower rate of decay within a specified mass of material results in a lower specific activity.
Furthermore, the amount of helium in zircons from hot rock is also much more consistent with a Earth (helium derives from the decay of radioactive elements).
The forms issued by radioisotope laboratories for submission with samples to be dated commonly ask how old the sample is expected to be. Why? If the techniques were absolutely objective and reliable, such information would not be necessary. Presumably, the laboratories know that anomalous dates are common, so they need some check on whether they have obtained a “good” date.